Vista - Access: Local Only

I made the mistake of trying to upgrade to Vista Home Premium a couple of weeks ago. I haven't been able to connect to the internet via the ethernet connection ever since. Trawling the web for solutions hasn't helped. There have been tons of people with the same problem and no resolution. Hence I've thrown this post up with the intention of posting the solution once I've found it.

Doing my bit to make the world a better place.

Update: The fix is here.